Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/16144#discussion_r90939139
--- Diff: core/src/main/scala/org/apache/spark/SparkContext.scala ---
@@ -292,7 +292,7 @@ class SparkContext(config: SparkConf) extends Logging {
private[spark] val executorEnvs = HashMap[String, String]()
// Set SPARK_USER for user who is running SparkContext.
- val sparkUser = Utils.getCurrentUserName()
+ val sparkUser: String = Utils.getCurrentUserName()
--- End diff --
Although pretty harmless, I don't know if this type adds clarity, and we
don't specify it by default
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